A600 8Mb fast expansion

[alexh]

lordv wrote:
Please say me somebody what address space is for PCMCIA on A600, then I'll give you clear answer.

0x600000 to 0x9FFFFF

[alexh]

rkauer wrote:
68000 use a 24bit address space = 8Mb

24-bit = 16Mb ;-)

[alexh]

Could you add a config register?

[alexh]

I was wondering if you could add a register that when you write a particular value to it, it stops decoding addresses in the upper 4 Mbyte range.

You could then switch on/off the upper 4Mbytes in software.

[alexh]

TjLaZer wrote:
You should make it so  it accepts a single 72pin SIMM!  That way the end user can install a 4MB or 8MB SIMM!

Just installing a smaller SIMM doesn't make it PCMCIA friendly!

[alexh]

Why does anyone care about sockets and SIMMS etc. if the boards come fully populated with 8Mbytes soldered down and a jumper?

[alexh]

rkauer wrote:
Because not every SIMM have the same chips on it.

Did you read what I put? What does that matter if they are sold with the memory already populated?

[alexh]

rkauer wrote:
I mentioned it because maybe the board could be sent without any chips (bare board).

I think the advantages of the seller to populate the board to 8Mbyte before shipping outweigh the disadvantages of designing the board to take a simm slot and then sourcing the simms.

[alexh]

I'd like to order a board populated to 4Mbytes ;-)

[alexh]

Yes.
No.

[alexh]

I am more confused than ever about how this fits in the A600.

Any pictures of you putting it in place?

2-level board connected with standoffs?

[alexh]

rkauer wrote:
Any chance to use a selector switch behind the A600 to avoid keep opening it?

It's a jumper, just solder two wires to a dipole switch.

7.5Mbytes in PCMCIA friendly mode should be good enough for most A600 applications (i.e. WHDload). I doubt I'll ever change the jumpers.

@LordV
Do you think there would be enough height clearance to use one of these??

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230187497732

[alexh]

The benefit of the one I mention is that it is internal, no data cable, no power cables. Just plugs directly ontop of the IDE header.

I'm not sure there will be enough clearance but we'll find out.

[alexh]

I was probably the one of the first to place an order yesterday evening minutes after Lordv posted and at 2pm today I get this mail:

SAS-Pack wrote:
We have recieved an order from you. please, specify your order, as we have recieved empty order form from you, and let us know what exactly you are wish to order.

I know I filled in the form correctly. D'oh I hope I've not missed out :-(

[alexh]

tokyoracer wrote:
Do we need to supply a 68000 PLCC and am I right in thinking it's actually mounted upside down? :-?

No this unit clips over the A600's SMT 68000